1 /* 2 * Copyright (c) 2006-2018, RT-Thread Development Team 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 * 2011-01-13 weety 9 */ 10 #include <rtthread.h> 11 12 /*****************************/ 13 /* CPU Mode */ 14 /*****************************/ 15 #define USERMODE 0x10 16 #define FIQMODE 0x11 17 #define IRQMODE 0x12 18 #define SVCMODE 0x13 19 #define ABORTMODE 0x17 20 #define UNDEFMODE 0x1b 21 #define MODEMASK 0x1f 22 #define NOINT 0xc0 23 24 /** 25 * This function will initialize thread stack 26 * 27 * @param tentry the entry of thread 28 * @param parameter the parameter of entry 29 * @param stack_addr the beginning stack address 30 * @param texit the function will be called when thread exit 31 * 32 * @return stack address 33 */ rt_hw_stack_init(void * tentry,void * parameter,rt_uint8_t * stack_addr,void * texit)34rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, 35 rt_uint8_t *stack_addr, void *texit) 36 { 37 rt_uint32_t *stk; 38 39 stack_addr += sizeof(rt_uint32_t); 40 stack_addr = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8); 41 stk = (rt_uint32_t *)stack_addr; 42 *(--stk) = (rt_uint32_t)tentry; /* entry point */ 43 *(--stk) = (rt_uint32_t)texit; /* lr */ 44 *(--stk) = 0xdeadbeef; /* r12 */ 45 *(--stk) = 0xdeadbeef; /* r11 */ 46 *(--stk) = 0xdeadbeef; /* r10 */ 47 *(--stk) = 0xdeadbeef; /* r9 */ 48 *(--stk) = 0xdeadbeef; /* r8 */ 49 *(--stk) = 0xdeadbeef; /* r7 */ 50 *(--stk) = 0xdeadbeef; /* r6 */ 51 *(--stk) = 0xdeadbeef; /* r5 */ 52 *(--stk) = 0xdeadbeef; /* r4 */ 53 *(--stk) = 0xdeadbeef; /* r3 */ 54 *(--stk) = 0xdeadbeef; /* r2 */ 55 *(--stk) = 0xdeadbeef; /* r1 */ 56 *(--stk) = (rt_uint32_t)parameter; /* r0 : argument */ 57 58 /* cpsr */ 59 if ((rt_uint32_t)tentry & 0x01) 60 *(--stk) = SVCMODE | 0x20; /* thumb mode */ 61 else 62 *(--stk) = SVCMODE; /* arm mode */ 63 64 /* return task's current stack address */ 65 return (rt_uint8_t *)stk; 66 } 67 68